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        <h3 id="正则表达式是匹配模式，要么匹配字符，要么匹配位置"><a href="#正则表达式是匹配模式，要么匹配字符，要么匹配位置" class="headerlink" title="正则表达式是匹配模式，要么匹配字符，要么匹配位置"></a>正则表达式是匹配模式，要么匹配字符，要么匹配位置</h3><p>const reg = /[^abc][def]g{2,5}\da?/g(修饰符)</p>
<h4 id="修饰符-i-g-m"><a href="#修饰符-i-g-m" class="headerlink" title="修饰符:i,g,m"></a>修饰符:i,g,m</h4><ul>
<li>i表示的含义是忽略大小写进行匹配</li>
<li>g表示全局匹配,即匹配到第一个之后不停止继续匹配</li>
<li>m表示多行匹配即,遇到换行后不停止匹配继续直到被匹配字符串结束<a id="more"></a>
</li>
</ul>
<h4 id="方法"><a href="#方法" class="headerlink" title="方法"></a><a href="https://www.cnblogs.com/myzhibie/p/4365142.html" target="_blank" rel="noopener">方法</a></h4><ol>
<li>对于正则表达式<ul>
<li>regObj.test(str) ：测试某个字符串是否与正则匹配，匹配就返回true</li>
<li>regObj.exec</li>
<li>regObj.compile</li>
</ul>
</li>
<li>对于字符串<ul>
<li>str.search(reg) : 查找第一次匹配的子字符串的位置，如果找到就返回一个number类型的index值，否则返回-1</li>
<li>str.match(reg) : 返回匹配的字符串</li>
<li>str.replace()</li>
<li>str.split()</li>
</ul>
</li>
</ol>
<h3 id="正题"><a href="#正题" class="headerlink" title="正题"></a><a href="https://zhuanlan.zhihu.com/p/27338649?utm_source=com.tencent.tim&amp;utm_medium=social" target="_blank" rel="noopener">正题</a></h3><h4 id="横向模糊搜索"><a href="#横向模糊搜索" class="headerlink" title="横向模糊搜索"></a>横向模糊搜索</h4><ul>
<li><code>var regex = /ab{2,5}c/g</code> : g，它是正则的一个修饰符。表示全局匹配，即在目标字符串中按顺序找到满足匹配模式的所有子串</li>
</ul>
<h4 id="纵向模糊搜索"><a href="#纵向模糊搜索" class="headerlink" title="纵向模糊搜索"></a>纵向模糊搜索</h4><ul>
<li><code>var regex = /a[bcd]e/g</code></li>
</ul>
<h4 id="字符组：需要强调的是，虽叫字符组（字符类），但只是其中一个字符。例如-abc-，表示匹配一个字符，它可以是“a”、“b”、“c”之一。"><a href="#字符组：需要强调的是，虽叫字符组（字符类），但只是其中一个字符。例如-abc-，表示匹配一个字符，它可以是“a”、“b”、“c”之一。" class="headerlink" title="字符组：需要强调的是，虽叫字符组（字符类），但只是其中一个字符。例如[abc]，表示匹配一个字符，它可以是“a”、“b”、“c”之一。"></a>字符组：需要强调的是，虽叫字符组（字符类），但只是其中一个字符。例如[abc]，表示匹配一个字符，它可以是“a”、“b”、“c”之一。</h4><ol>
<li>范围表示法 : 如[123456abcdefGHIJKLM]，可以写成[1-6a-fG-M]</li>
<li>排除字符组 : [^abc]表示是一个除”a”、”b”、”c”之外的任意一个字符,但是在括号外表示开始位置,$表示结束</li>
<li>常见简写：<ul>
<li>\d 就是[0-9]。表示是一位数字。记忆方式：其英文是digit（数字）</li>
<li>\D 就是[^0-9]。表示除数字外的任意字符</li>
<li>\w 就是[0-9a-zA-Z_]。表示数字、大小写字母和下划线。记忆方式：w是word的简写，也称单词字符</li>
<li>\W 就是[^0-9a-zA-Z_]。非单词字符</li>
<li>\s 就是[ \t\v\n\r\f]。表示空白符，包括空格、水平制表符、垂直制表符、换行符、回车符、换页符。记忆方式：s是space character的首字母</li>
<li>\S 就是[^ \t\v\n\r\f]。 非空白符</li>
<li>. 就是[^\n\r\u2028\u2029]。通配符，表示几乎任意字符。换行符、回车符、行分隔符和段分隔符除外。记忆方式：想想省略号…中的每个点，都可以理解成占位符，表示任何类似的东西</li>
</ul>
</li>
</ol>
<h4 id="量词"><a href="#量词" class="headerlink" title="量词"></a>量词</h4><ol>
<li>简写形式<ul>
<li>{m,} 表示至少出现m次</li>
<li>{m} 等价于{m,m}，表示出现m次</li>
<li>? 等价于{0,1}，表示出现或者不出现。记忆方式：问号的意思表示，有吗？</li>
<li>+ 等价于{1,}，表示出现至少一次。记忆方式：加号是追加的意思，得先有一个，然后才考虑追加</li>
<li>* 等价于{0,}，表示出现任意次，有可能不出现。记忆方式：看看天上的星星，可能一颗没有，可能零散有几颗，可能数也数不过来</li>
</ul>
</li>
<li><p>贪婪匹配和惰性匹配</p>
<ul>
<li><p>其是贪婪的</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> regex = <span class="regexp">/\d&#123;2,5&#125;/g</span>;</span><br><span class="line"><span class="keyword">var</span> string = <span class="string">"123 1234 12345 123456"</span>;</span><br><span class="line"><span class="built_in">console</span>.log( string.match(regex) ); <span class="comment">// ["123", "1234", "12345", "12345"]</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>/\d{2,5}?/表示，虽然2到5次都行，当2个就够的时候，就不在往下尝试了</p>
</li>
</ul>
</li>
<li><p>多选分支</p>
<ul>
<li><p>多选分支可以支持多个子模式任选其一<br>-</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> regex = <span class="regexp">/good|nice/g</span>;</span><br><span class="line"><span class="keyword">var</span> string = <span class="string">"good idea, nice try."</span>;</span><br><span class="line"><span class="built_in">console</span>.log( string.match(regex) ); <span class="comment">// ["good", "nice"]</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>分支结构也是惰性的，即当前面的匹配上了，后面的就不再尝试了</p>
</li>
</ul>
</li>
<li><p>关于$1</p>
</li>
</ol>
<ul>
<li>([a-z]+)([/u4396-/u4993]+)：$1就是第一个括号匹配的内容的简写</li>
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